Grinding mill



Aug. 5, 1930.

c. o. BARTLEY GRINDING MILL Original Filed Feb. 14, 1927 2 Sheets-Shee 1 A TTORNE Y.

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I Y V/I VAN? Aug. 5, 930. c. o. BARTLEY 1,772,026

GRIENDING MILL I Original Filed Feb. 14, 1927 2 Sheets-Sheet 2 INVENTOR.

5 TTORNEY.

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Patented Aug. 5, 1930 CLIFFORD 0. BARTLEY, 01? DENVER, COLORADO GRINDING MILL Application filed. February 14, 1927, Serial No. 168,154. Renewed October 22, 1928.

My invention relates to grinding machines of the ball or tube-mill type and more particularly to improvements in tube or ball mills provided with a sectional lining, as disclosed in U. S. Letters Patent No. 1,457,487, issued June 5, 1923 to Joseph S. Bartley, now deceased.

The lining shown and described in the patentcomprised a plurality of sections which were held in place by a single key. The sections were flanged to meet in longitudinal channels of the shell of the mill and in case one of the sections was worn or broken, it became necessary to remove all of the sections from an end of the shell to the broken or worn section and then replace them after the defective section had been renewed.

It is obvious that for this reason, repair of the lining was a laborious and time-taking task and it is the principal object of the present invention to provide in a mill of the above a sectional lining, the sections of which may be separately removed and replaced without disturbing the others.

A further object of the invention resides in providing a gauge which in a simple manner indicates the presence of a worn or broken section of the lining and still other objects reside, in details of construction as drawings and shown 1n the accompanying hereinafter to be described.

In the drawings in the several views of which like parts are similarly designated Figure 1 represents a partially sectional side-elevation of a grinding mill equipped with a sectional lining in accordance with the present invention,

Figure 2, an enlarged transverse section taken on the line 2-2 Figure 1,

Figures 3 and 4, fragmentary transverse sections through the mill, showing modifications of the means for holding the lining sections in place,

Figure 5, a fragmentary longitudinal section of a portion of the mill, illustrating a modified method of extending the flanges of the lining sections,

Figure 6, a section along the line ure 5,

66 Fig- Figure 7, an enlarged section taken on the line 7-7 Figure 5,

Figure 8, a fragmentary longitudinal section through a grinding modification of the means sectional lining,

mill, showing a for securing the Fi 'ure 9, an enlarged section on the line Figures of Figure 9, illustratin igure 8, and

10 and 11, sections similar to that g other modifications of the means for holding the sections of the lining in place.

The mill as shown in the drawings, comprlses a cylindrical shell 5 provided with longitudinal channels 6 for the attachment of the sectional lining, and

heads 7 and 8.

closed at its ends by The mill is rotatably supported in journal bearings 9 by means wheel 13 secured ext meshes with a pinion mechanism not shown of hollow trunnions 10 and 12 projecting from the heads, agear eriorly of the shell of a suitable driving in the drawings, and

a scoop 14 on the trunnion at the feed end of the mill dips in the operation, into the material to be reduced,

to supply the same to the interior of the mill at regular intervals.

The channels 6 are preferably formed in externally projecting longitudinal ridges of the shell but they may present invention, be manner if for formed in a different so desired. The channels are prefthe purpose of the erably made with outwardly converging sides to facilitate insertion of the lining sec tions as will hereinafter be described and they are formed at quadrant or other equidistant points around the circumference of the shell.

The lining which is wear-resisting materia number of sections 15 end adjoining series.

made of a hard and l, is composed of a arranged in end-to- The sections of each series are circularly arranged in planes transverse of the shell and 1n accordance with the present invention,

arate removal or replacement.

they are assembled for sep- The lining sections are to this end composed of arcuate plates provided with opposite outwardly projecting channels of the shell.

The channels are su flanges 16 adapted to enter into the fiiciently wide to accommodate the flanges of two sections of the series, together with an interposed lockingdevice p made Wood or other expansible material. The wedges may be driven into the outer portion of the spaces between the flanges of the spaces are wedged in place between the converging faces of the flanges and not only aid in the grinding action but efl'ecti vely protect the ends of the lining sections from wear and breakage. The lining sections are men forced by rounded bosses l8 projecting from their inner faces and by forming two of these bosses at their outer ends, the edges thereof are further protected against wear andbreak- A simple gauge to indicate the condition of the lining sections, is shown at 9 in Figures 2 and 3. The gauge consists of a screw extending through a threaded aperture of the shell into a recess of one of the sections of the lining. The screw is turned home against the breast of the recess and by trying to turn it further from time to time the condition of the lining section is ascertained. If no resistance is encountered and the screw can be turned inwardly, the lining-section is either broken or has worn to the end of its recess and in either case replacement of the section by another is in order.

To replace a lining section in a mill of the present construction, the broken or worn sec-' tion is removed from the shell and another section is inserted in the place thereof. In order to facilitate the placement of a new section in circular alinement with the other sections of a series, one of the flanges of the new section is narrowed as indicated at 20 in Figure 2, so that the flange may enter the respective channel of the shell in an arcuate movement as shown in broken lines in the same figure.

The wedges at opposite sides of the new section which had been removed to admit the flanges of the section to the channels of the shell, are again driven into the spaces between the flanges of the adjoining sections after the new section is in place.

In order that the lining may not be weak ened by the reduced width of the narrowed flange, the latter may be extended after it is in position in the channel and before the wedge is driven intoplace.

An extension deviceof simple construction consists of a strip 21 which is recessed at one side to admit the flange 20 and which extends beyond the same to the 'full width of the flanges of the other sections.

Another method of exten ding the narrowed flanges is illustrated in Figures 5, 6 and 7.

referably composed of a wedge 17 The narrow flange 20 of the lining section is in this construction provided with a number of grooves 22 to receive correspondingly formed -tapering tenons of an extension piece 23.

It will beobserved that the last described extension has the advantageof not adding to the thickness of the flange so that the flange may correspond in thickness with the others instead of being reduced as in the first described form illustrated in Figure 3. The frictional contact of the flanges of the lining sections with the interposed wedge may be increased by corrugating or otherwise roughening the faces of the flanges as shown atj24 in Figure 3. i

In pebble mills 0'. in other mills in which the lining is not subjected to excessive wear and replacement of its sections is but seldom required, the faces of the flanges in the channels of the shell may be'slanted to diverge I toward the ends of the channels as illustrated in Figure 4, and wedges 25 are driven into the spaces between the flanges from an end of the shell. 7 V

In larger mills, the same construction of lining may be employed but the wedges are driven between the flanges of the sections from the inside of the mill by making the wedges in sections, as illustrated in Figures 10 and 11 of the drawings.

In Figure 10, the middle part 26 of the wedge is tapered, and the outer-parts 27 of the same are driven into the spaces between the tapered part and the flanges. It is preferable to make the outer parts of wood or other readily expanding material and by providing the middle part with recesses as at 28, the outer parts can be securely locked in place by the expansion of their substance into the recesses. The outer parts may also be made of cement or other plastic material, if so desired.

The form shown in Figure 11 differs from that of Figure 10 only in that the outer parts 29 of the locking wedge are tapered and the middle part 30 is driven into the space between the outer parts. In the construction illustrated in Figures 8 and 9 the sections of the lining are secured by a rod 31 driven through the space between their diverging flanges from one end of the mill to the other.

If it is necessary to replace a broken or worn section, the rod is withdrawn through one of the ends of the mill to a point beyond the defective section, and returned to its original position after a new lining-section has been installed in the place of the other.

The channels of the shell may be of outwardly tapering section as those shown in Figures 2, 3. 4 and 7, or they may taper inwardly as illustrated in Figure 10 or they may be of rectangular section as shown in Figures 9 and 11.

Other variations in the means for securing the lining sections or for extending the flanges thereof may be resorted to within the scope of the invention as delined in the hereunto appended claims.

Having thus described my invention, what I claim and desireto secure by Letters Patent is 1. In a mill ot' the character described, a channeled shell, :1. lining composed of sections having flanges in the channels of the shell, in spaced relation to each other, a flange at one side of a section of the lining being narrower than that atthe other side, and wedges in the spaces between the flanges of adjoining sections to secure the lining inplace within the shell.

2. In a mill ot' the character described, a channeled shell, a lining composed of sections having flanges in the channels of the shell, in spaced relation to each other, a flange on a section of the lining being reduced in width to permit of its entering a channel of the shell past the flange of an adjoining section. an extension for the narrowed flange, and wedges in the spaces between the flanges of adjoining sections to secure the lining in place within the shell.

3. In a mill of the character described, a. channeled shell a lining composed of sections having flanges in the channels of the shell, in spaced relation to each other, av flange on a section of the lining being reduced in width to permit of its entering a channel of the shell past the flange of an adoining section,

the narrowed flange having a groove, an extension for the narrowed flange having a tenon fitting in the groove, and wedges in the spaces between the flanges of adjoining sections to secure the lining in place Within the shell.

4. In a mill of the character described, a channeled shell, a lining composed of sections having flanges in the channels of the shell and provided with protective bosses long their flanged edges, and means in the spaces between the flanges to secure the'lining in place within the shell.

5. In a mill of the characterv described, a. channeled shell, a lining composed'of sections having flanges in the channels of the shell, in spaced relation to each other, a

flange on a section of the lining being reduced in width suflicient to per nitit to be moved inwardly past the opposed flange in the same channel, and wedges in the spaces between the flanges of the adjoining sections to secure the lining in place within the shell.

(3. In a mill of the character described, a channeled shell, a lining composed of sections having flanges in the channels of the shell, in spaced relation to each other, and wedges in the spaces between the flanges of adjoining sections to secure the lining in place within the shell, an end of one of said signature.

CLIFFORD O. BARTLEY.

in the same channel when the 

